Arrangement in striking tools



Feb. 7, 1933. E, M, AGREN ,89,992

ARRANGEMENT IN STRIKING TOOLS Filed Deo. l, 1930 2 Sheets-Sheet l Feb. 7, 1933. I E MQ AGREN v 1,896,992

ARRANGEMENT IN STRIKING TOOLS Filed Dec. l, 1930 2 Sheets-Sheet 2 I ren- /N veA/nf Patented Feb. 7, 1933 UNITED STATES ERNST MALCUS GREN, OF STOCKHOLM, SWEDEN ARBANGEMENT IN STRIKING TOOLS Application med December 1, 1936, Serial No. 499,359, and in Sweden February 6, 1930.

The present invention relates to striking tools of the kind in which a reciprocating striking body, which may also rotate, acts upon an anvil, which may or may not rotate,

in which the tool or the tool holder is inserted. The object of the invention is. to enable the tool to be simply and easily dismounted so as to permit the parts exposed to the hardest wear-for instance the striking body and the anvil-to be easily exchanged. .According to the invention this end is achieved by supporting the anvil in the frame by means of a divided ring or sleeve engaging the anvil, said ring or sleeve co-operating lwith a stop arranged in the frame and limiting the motion of the anvil in an axial direction, and

by providing the frame, at or in the proxim-4 ity o the point where the ring is supported, with a detachable part so the two parts being 2 so constructed and arranged as to allow the ring to be removed from the anvil in order to4 make the withdrawal of the anvil possible. Other features of the invention will be more clearly set forth in connection with the description of the embodiment shown in the drawings, in which Fig. 1 shows the tool as a whole, in side view, and Figs. 2 and 3 are longitudinal sections through the bottom part of the tool on the line II--II in Fig. 4, the parts occupying different positions in these two figures. Fig. 4 is a plan from below of the tool and Fig. 5 is a section on the line V-V in Fig. 3. Referring to the drawings 1, 2 and 3 are three frame parts, which are joined by means of the bolts 4. Within these frame parts the different parts of the striking tool are arranged. In the embodiment shown in the drawings the electric motor 5 is supposed to 4Orotate a sleeve 6, in which the striking body 7 is adapted to slide and is given an up and down motion partly by the influence of the shock of the striking body against the anvil 8, and partly by an energy storer or other arrangement, for instance balls 9 acted upon by centrifugal force. The anvil 8 which comprises a body portion and an enlarged head, is supported partly in the top part 10 of the frame part 2 and partly in the bottom part 11 of said frame part and at this lastmentioned point the bearing is provided by means of a divided ring or sleeve 12, which extends into an annular groove in the anvil.

The bearing of the frame part 11 is somewhat longer than the height of the ring 12 55 so as to allow an axial displacement to be given to the ring and, thus, to the anvil. In order to limit the amplitude of this axial displacement and thus to prevent the anvil from being pressed too far upwards in the direction towards the striking tool against the action of a spring 13, there is a stop 14 in the Jframe part at one side of the bearing point of the ring 12.

When the tool is assembled' the different 65 parts occupy the position shown in Fig. 2. When it is desired to remove, for instance, the

.anvil 8, the n'uts 15 on the bolts 4 are removed and the bolts are turned a little so that the T-shaped heads 16 are brought out of engage- 7 ment with the openings 17 in the frame part 1 and the bolts 4 may be removed and, thus, the frame part 3 may be brought downwards and the frame part 1 upwards in relation to the frame part 2, whereby the ring or sleeve 12 is freed and may be removed from the anvil. The anvil is now free so that it may be drawn upwards out of the frame part 2 and the striking body 7 may be dra-wn downwards out of the frame part 1, as readily set forth by Fig. 3. When assembling the tool the operation described is reversed. Of course, it is not necessary ,thatthe dilerent frame parts should be kept together, in the way now described, by means of bolts provided with hook-shaped heads. Instead ordinary bolts, for instance, may be used which are screwed into suitable fastenings in the frame or a part connected therewith. The bearing and tightening arrangements for the striking body, the anvil and the tool 19 inserted in the anvil may also be constructed in many different ways, as the arrangements, excepting the divided bearing ring 12, form no essential part of this invention. The striking body, the anvil, and the balls 9 for moving the striking body against the anvil may be arranged as described in the patent specifications Nos. 1,776,057 and 1,816,104.

Having now particularly described the nature of my invention and the manner of its operation, what I claim is 1. A striking tool of the character de- Y 5 scribed including a striking body, an anvil having` a body portion and an enlarged head, a sectional ring' detachably engageable with said body portion, a pl'urality of frame sections and means for releasably fastening said frame sections together in longitudinal alignment, one of said frame sections having a bore serving as a guide for one end of the anvil body and another of said frame sections having a bore through which the other end ofthe anvil body passes, said bores at adjacent ends of said frame sections being both enlarged to form a chamber to receive and guide said sectional ring, one end of said chamber constituting an abutment for the sectional ring to limit the axial movement of the anvil( towards the striking body, while when said frame members are released and moved apart the sections of the ring are in alignment with and removable through the resulting periph .25 eral openin in the chamber to permit withdrawal of t e anvil.

2. A striking tool as claimed in claim 1 including a spring arranged about the anvil i and bearing against a part of one of the 39 frame members and against the sectional ring, said spring acting as a balancing spring when the tool is in operation and acting also to thrust the ring into position for removal when the frame sections are released and moved apart.

3. A striking tool as claimed in claim 1 wherein the anvil is provided with a groove and wherein the ring consists of twoparts detachably engaged with the groove.

40 In testimony whereof I afx my signature.

ERNST MALCUS GREN. 

